package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

@RabbitListener(queues = "stock.release.stock.queue")
@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {
    @Autowired
    WareSkuDao wareSkuDao;
    @Autowired
    ProductFeignService productFeignService;
    @Autowired
    RabbitTemplate rabbitTemplate;
    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;
    @Autowired
    WareOrderTaskService orderTaskService;
    @Autowired
    OrderFeignService orderFeignService;

    /**
     * 库存自动解锁
     * @param to
     * @param message
     */

    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId){
        //库存解锁
        wareSkuDao.unlockStock(skuId,wareId,num);
        //更新库存
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);    //变为已解锁
        orderTaskDetailService.updateById(entity);

    }
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String)params.get("key");
        if(!StringUtils.isEmpty(skuId)){
            queryWrapper.eq("sku_id",skuId);
        }
        String wareId = (String)params.get("key");
        if(!StringUtils.isEmpty(wareId)){
            queryWrapper.eq("ware_id",wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1 判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if(entities == null || entities.size() == 0){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字
            try{
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");
                if(info.getCode() == 0){
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            }catch(Exception e){

            }

            wareSkuDao.insert(skuEntity);
        }else{

            wareSkuDao.addStock(skuId,wareId,skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkuHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //SELECT SUM(stock - stock_locked) FROM wms_ware_sku WHERE sku_id = 1
            Long count = baseMapper.getSkuHasStock(skuId);

            vo.setSkuId(skuId);
            vo.setHasStock(count==null?false:count>0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     * @param vo
     * @return
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);

        // 按照下单的收货地址，找到一个就近仓库，锁定库存
        // 找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());
        //锁定库存
        for(SkuWareHasStock hasStock: collect){
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if(wareIds == null || wareIds.size() == 0){
                throw  new NoStockException(skuId);
            }
            for(Long wareId: wareIds){
                //成功就返回1  否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if(count == 1){
                    skuStocked = true;
                    //TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(entity);
                    //发送库存锁定消息至延迟队列
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo detailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity,detailTo);
                    lockedTo.setDetailTo(detailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                }else{
                    //当期仓库锁失败，重试下一个仓库
                }
            }
            if(skuStocked == false){
                //当前商品所有仓库都没有锁住
                throw  new NoStockException(skuId);
            }
        }

        return true;

    }

    @Override
    public void unlockStock(StockLockedTo to) {



            StockDetailTo detail = to.getDetailTo();
            Long detailId = detail.getId();
            //解锁
            //查询 数据库关于这个订单的锁定库存信息
            //有：
            //没有 库存锁定失败 ， 库存回滚了， 这种情况无需解锁
            WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
            if(byId != null){
                //解锁
                Long id = to.getId();
                WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
                String orderSn = taskEntity.getOrderSn();
                R r = orderFeignService.getOrderStatus(orderSn);
                if(r.getCode() == 0){
                    //订单数据返回成功
                    OrderVo data = r.getData(new TypeReference<OrderVo>() {
                    });
                    if(data == null || data.getStatus() == 4){
                        // 订单不存在
                        //订单已经被取消了，才能解锁库存
                        //detailId == 1
                        if(byId.getLockStatus() ==1 ){
                            //当前库存工作单详情  状态1 是已锁定但未解锁
                            unLockStock(detail.getSkuId(),detail.getWareId(),detail.getSkuNum(),detailId);
                        }
                    }
                }else{
                    //消息拒绝以后重新放到队列里面，让别人继续解锁
                    throw new RuntimeException("远程服务orderFeign中方法执行失败");
                }
            }else{
                //无需解锁
            }
    }

    //防止订单服务卡顿，导致订单状态消息一直改不了，库存消息优先到期。查订单状态新建状态。什么都不做就走了。
    //导致卡顿的订单，永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        WareOrderTaskEntity task =   orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单找到所有  没有解锁的库存， 进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
        for(WareOrderTaskDetailEntity entity : entities){

            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private List<Long> wareId;
        private Integer num;
    }


}